Sandstone problem?

I know that in a few places, you can find Sandstone as a regular drop, but my wizard is having a problem, the Sandstone itself isn't appearing. I can see the sparkles that come from reagents on the street, and the 'Click X to collect' thing still appears, but the actual Sandstone remains hidden, this is kinda annoying because I need some Sandstone, but can't see the sparkles from across the street all the time.

I get the same thing, shadow on the ground, and cannot see it. I didn't realize it was there half the time, and went through transmute sessions until I got what I needed. I figured it was just something that didn't update on my system.